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Message-ID: <20170605192216.21596-1-igor.stoppa@huawei.com>
Date:   Mon, 5 Jun 2017 22:22:11 +0300
From:   Igor Stoppa <igor.stoppa@...wei.com>
To:     <keescook@...omium.org>, <mhocko@...nel.org>, <jmorris@...ei.org>
CC:     <penguin-kernel@...ove.SAKURA.ne.jp>, <paul@...l-moore.com>,
        <sds@...ho.nsa.gov>, <casey@...aufler-ca.com>, <hch@...radead.org>,
        <labbott@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <kernel-hardening@...ts.openwall.com>,
        Igor Stoppa <igor.stoppa@...wei.com>
Subject: 

Subject: [RFC v4 PATCH 0/5] NOT FOR MERGE - ro protection for dynamic data

This patchset introduces the possibility of protecting memory that has
been allocated dynamically.

The memory is managed in pools: when a pool is made R/O, all the memory
that is part of it, will become R/O.

A R/O pool can be destroyed to recover its memory, but it cannot be
turned back into R/W mode.

This is intentional and this feature is meant for data that doesn't need
further modifications, after initialization.

An example is provided, showing how to turn into a boot-time option the
writable state of the security hooks.
Prior to this patch, it was a compile-time option.

This is made possible, thanks to Tetsuo Handa's rewor of the hooks
structure (included in the patchset).

Notes:

* I have performed some preliminary test on qemu x86_64 and the changes
  seem to hold, but more extensive testing is required.

* I'll be AFK for about a week, so I preferred to share this version, even
  if not thoroughly tested, in the hope to get preliminary comments, but
  it is rough around the edges.

Igor Stoppa (4):
  Protectable Memory Allocator
  Protectable Memory Allocator - Debug interface
  Make LSM Writable Hooks a command line option
  NOT FOR MERGE - Protectable Memory Allocator test

Tetsuo Handa (1):
  LSM: Convert security_hook_heads into explicit array of struct
    list_head

 include/linux/lsm_hooks.h      | 412 ++++++++++++++++++++---------------------
 include/linux/page-flags.h     |   2 +
 include/linux/pmalloc.h        |  20 ++
 include/trace/events/mmflags.h |   1 +
 init/main.c                    |   2 +
 mm/Kconfig                     |  11 ++
 mm/Makefile                    |   4 +-
 mm/pmalloc.c                   | 340 ++++++++++++++++++++++++++++++++++
 mm/pmalloc_test.c              | 172 +++++++++++++++++
 mm/usercopy.c                  |  24 ++-
 security/security.c            |  58 ++++--
 11 files changed, 814 insertions(+), 232 deletions(-)
 create mode 100644 include/linux/pmalloc.h
 create mode 100644 mm/pmalloc.c
 create mode 100644 mm/pmalloc_test.c

-- 
2.9.3